The Tool Desk
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What Pi-hole can—and cannot—do
Pi-hole is a DNS sinkhole: it can block requests to selected domains from devices that use it for DNS. Its official overview includes smart TVs among the devices it can help protect from unwanted content. That makes it useful for filtering some TV connections across a household network.
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DNS filtering is not complete traffic inspection. Pi-hole does not change a privacy setting inside the TV, and a blocked-domain list cannot guarantee that every data flow is covered. DNS-based filtering may also miss connections that do not rely on the filtered DNS path; what happens depends on the device and network configuration. The Pi-hole documentation’s specific Firefox DNS-over-HTTPS canary setting is not evidence that Pi-hole prevents every form of encrypted DNS or direct-IP connection.
A block can also disrupt a TV feature. Treat the query log as a troubleshooting aid: if a function stops working, identify the relevant blocked domain and decide whether restoring that connection is worth the privacy tradeoff. Don’t allow domains simply because they appear in the log.
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Turn off optional collection at the TV
Samsung viewing recognition
Samsung says Automatic Content Recognition (ACR) is optional on supported Smart TVs and runs only if the user opts into its Viewing Information Services notice. The company says users can change the setting in the TV’s settings. When enabled, Samsung describes possible collection of viewing history, a Personalized Service ID, and an IP address. Look for privacy, terms, or viewing-information controls on your specific model rather than relying on a universal menu path; labels and availability can vary by model, region, and firmware. See Samsung’s ACR guidance.
Check other data categories separately
Turning off ACR does not establish that all other collection has stopped. Samsung’s privacy notice separately describes information that third-party applications and content providers may receive, including IP addresses and device identifiers. Google TV documentation names watch activity, app interactions, installed apps, diagnostics, device IDs, and approximate location among information used by services. Review the categories and controls that apply to your TV and its apps; one setting may address only one category. See Samsung’s privacy notice and Google TV’s privacy information.
Consider the feature cost of disabling voice sharing
Google documents a location setting on Google TV. On some non-Android TV devices with Google Assistant, a separate information-sharing control can also be disabled; Google says Assistant and manufacturer voice services then stop working. If you rely on voice commands, weigh that functional loss before switching it off. Details are in Google TV’s privacy guidance and Google’s Assistant information-sharing help.
Use Pi-hole as a second layer
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Route DNS through Pi-hole. Where your router allows it, set the household DNS server to Pi-hole. Pi-hole’s project instructions also describe using its DHCP server when the router cannot set DNS, or configuring clients manually. Follow the setup guidance in the Pi-hole project documentation; the exact router controls depend on its model and configuration.
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Check whether the TV is using Pi-hole. Look for the TV’s requests in Pi-hole’s query log while using the TV. If requests do not appear, the TV may not be sending DNS queries through Pi-hole; a missing entry alone does not prove what other connections the TV makes.
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Handle blocks selectively. If a TV function fails, use the query log to investigate which blocked domain may be involved. Allow it only if you have identified a concrete failure and accept the tradeoff. Blocking more domains is not automatically better if it breaks features you want.
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Choose a query-logging privacy level. Pi-hole’s privacy settings include an anonymous mode that disables query-log and long-term database logging. That reduces the detail available to troubleshoot DNS behavior. Choose a level that fits your household’s privacy needs; see Pi-hole’s privacy-level documentation.
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Review app and streaming-service permissions
TV manufacturers are not the only parties involved. Each streaming app or content provider may have its own data practices and controls, separate from the TV’s settings. Review the permissions and privacy choices exposed by the apps you use, as well as the TV’s connected-device settings. The U.S. Federal Trade Commission advises people with internet-connected TVs or streaming devices to review their privacy settings and permissions. Its guidance also cautions that ad blockers do not necessarily block all ads or tracking: FTC guidance on smart-TV privacy.
Which privacy measure addresses which problem?
| Measure | What it can address | Limit or tradeoff |
|---|---|---|
| TV privacy settings | Optional ACR, viewing-information, location, personalization, or voice-sharing controls when the model offers them. | Controls and labels vary. Disabling one category does not show that other collection has stopped. |
| Pi-hole DNS filtering | Selected domain lookups from devices that use Pi-hole for DNS, including compatible smart TVs. | It filters at the DNS layer, not every kind of traffic, and some blocks can break TV functions. |
| App and service privacy review | Permissions and data choices exposed by individual TV apps and streaming services. | Each provider has separate settings and practices; review them individually. |
What to expect from a layered approach
There is no single switch in Pi-hole that makes a smart TV private. Use the TV’s own controls to limit optional collection, review app permissions, and route DNS through Pi-hole to block selected domains. These measures can reduce particular forms of data collection or communication, but they do not establish that the TV or its services collect nothing. Manufacturer disclosures describe stated practices, not independent verification of every device’s behavior.
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